package com.fanx.sample.web.common;

import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

/**
 * 统一Web响应
 */
@ControllerAdvice(basePackages = {"com.fanx.sample.web.controller"})
public class WebResponseBodyHandler implements ResponseBodyAdvice<Object> {

    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
    	ResponseBody responseBody = returnType.getMethod().getAnnotation(ResponseBody.class);
    	return responseBody == null;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType,
            Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request,
            ServerHttpResponse response) {
        if (body == null) {
            return WebResult.success();
        }
        if (body instanceof WebResult) {
            return body;
        }
        return WebResult.success(body);
    }
}